ACDS V10.0 - Thu May 02 06:18:21 CEST 2019
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Detailed Description of IX/53 :
XMM-Newton slew survey Source Catalogue, version 2.0 (XMM-SSC, 2017)
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Note : this is the description file of the original catalog.
This HTML page corresponds well to the original description, but some minor
changes in the format may have been introduced in the FITS output
files in order to allow for arithmetic operations on quantities
such as coordinates and times. h:m:s and d:m:s units are normally
converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the
units; the value given in the HTML files supersedes the value indicated in the ReadMe
file for this catalogue.
IX/53 XMM-Newton slew survey Source Catalogue, version 2.0 (XMM-SSC, 2017)
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The XMM-Newton slew survey Source Catalogue, version 2.0
XMM-SSC
<XMM-SSC, Leicester, UK (2017)>
=2018yCat.9053....0X
================================================================================
ADC_Keywords: X-ray sources; Surveys
Mission_Name: XMM
Keywords: catalogs - astronomical data bases - surveys - X-rays: general
Description:
XMMSL2 is the second catalogue of X-ray sources found in slew data
taken from the European Space Agency's (ESA) XMM-Newton observatory,
and has been constructed by members of the XMM SOC and the EPIC
consortium on behalf of ESA. This release uses results of work which
has been carried out within the framework of the EXTraS project
("Exploring the X-ray variable and Transient Sky"), funded from the
EU's Seventh Framework Programme under grant agreement no.607452.
This is the first release of XMMSL2 which contains data taken between
revolutions 314 and 2758. The previous catalogue was called
XMMSL1_Delta6 and contained slews up to revolution 2441.
The release includes two FITS files. A full catalogue
(xmmsl2_total.fits.gz), containing 72352 detections found with a
likelihood of DET_ML>8 and a "clean" catalogue (xmmsl2_clean.fits.gz)
where all known bad sources have been removed and where the detection
limit has been raised to DET_ML>10.5 in general and DET_ML>15.5 for
sources found in images with a higher than usual background. Efforts
have been made to identify spurious detections and 3017 have been
flagged as such in the full catalogue.
File Summary:
FileName Lrecl Records Explanations
× 80 . This file
× ReadMe 80 . This file
× xmmsl2c.dat 1219 29393 XMM-Newton slew survey Source Catalogue: XMMSL2
"clean version" (Release 2.0, 14th March 2017)
× xmmsl2c.fits 2880 9746 Clean XMMSL2 catalog in fits
× xmmsl2t.fits 2880 23976 Full XMMSL2 catalog (72352 detections)
See also:
IX/50 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR6 (XMM-SSC, 2016)
II/340 : XMM-OM Serendipitous Source Survey Catalogue XMM-SUSS2.1 (Page+ 2016)
https://www.cosmos.esa.int/web/xmm-newton/xmmsl2-ug : XMMSL2 Home Page
Byte-by-byte Description of file: xmmsl2c.dat
Bytes Format Units Label Explanations
1- 23 A23 --- XMMSL2 Official name for sources detected in
the XMM-Newton slew survey
(UNIQUE_SRCNAME) (1)
25- 34 A10 --- ObsId Observation number (OBSID) (2)
36- 38 I3 --- SNum Number which uniquely identifies each
detection in an observation (SOURCENUM)
40- 48 F9.5 deg RAdeg Right ascension (J2000) (RA) (3)
50- 58 F9.5 deg DEdeg Declination (J2000) (DEC) (3)
60- 65 F6.2 arcsec ePos Statistical error on the source position
(RADEC_ERR) (4)
67- 75 F9.5 deg GLON Galactic longitude (LII)
77- 85 F9.5 deg GLAT Galactic latitude (BII)
87- 95 F9.6 --- HR1 ? Hardness ratio (HR1) (5)
97-104 F8.6 --- e_HR1 ? rms uncertainty on HR1 (HR1_ERR) (6)
106-124 A19 --- DateS Start time of the slew containing
this source (DATE_OBS)
126-144 A19 --- DateE End time of the slew containing
this source (DATE_END)
146-157 E12.6 ct SctsB8 ? Number of background subtracted counts,
in the total energy band (0.2-12keV)
(SCTS_B8) (7)
159-167 F9.5 ct e_SctsB8 ? Statistical 1 sigma error on SctsB8
(SCTSB8ERR)
169-180 E12.6 ct SctsB7 ? Number of background subtracted counts,
in the hard energy band (2-12keV),
corrected for the PSF (SCTS_B7)
182-189 F8.5 ct e_SctsB7 ? Statistical 1 sigma error on SctsB7
(SCTSB7ERR)
191-202 E12.6 ct SctsB6 ? Number of background subtracted counts,
in the soft energy band (0.2-2keV),
corrected for the PSF (SCTS_B6)
204-211 F8.5 ct e_SctsB6 ? Statistical 1 sigma error on SctsB6
(SCTSB6ERR)
213-224 E12.6 pix XimaB8 ? X position in the total band image in
image pixels (XIMAB8)
226-237 E12.6 pix YimaB8 ? Y position in the total band image in
image pixels (YIMAB8)
239-250 E12.6 pix XimaB7 ? X position in the hard band image in
image pixels(XIMAB7)
252-263 E12.6 pix YimaB7 ? Y position in the hard band image in
image pixels(YIMAB7)
265-276 E12.6 pix XimaB6 ? X position in the soft band image in
image pixels(XIMAB6)
278-289 E12.6 pix YimaB6 ? Y position in the soft band image in
image pixels(YIMAB6)
291-299 F9.6 pix ExtB8 ? Spatial extension of the source in the
total energy band (EXT_B8) (7)
301-309 F9.6 pix e_ExtB8 ? Statistical one sigma error on ExtB8
(EXTB8ERR)
311-319 F9.6 pix ExtB7 ? Spatial extension of the source in the
hard energy band (EXT_B7) (7)
321-329 F9.6 pix e_ExtB7 ? Statistical one sigma error on ExtB7
(EXTB7ERR)
331-339 F9.6 pix ExtB6 ? Spatial extension of the source in
the soft energy band (EXT_B6) (7)
341-349 F9.6 pix e_ExtB6 ? Statistical one sigma error on ExtB6
(EXTB6ERR)
351-362 F12.6 --- DetMLB8 ? Detection likelihood in the total
(0.2-12keV) energy band (DETMLB8)
364-375 F12.6 --- DetMLB7 ? Detection likelihood in the hard
(2-12keV) energy band (DETMLB7)
377-388 F12.6 --- DetMLB6 ? Detection likelihood in the soft
(0.2-2keV) energy band (DETMLB6)
390-400 F11.6 --- ExtMLB8 ? Likelihood of the source being extended
in the total band (EXTMLB8)
402-412 F11.6 --- ExtMLB7 ? Likelihood of the source being extended
in the hard band (EXTMLB7)
414-424 F11.6 --- ExtMLB6 ? Likelihood of the source being extended
in the soft band (EXTMLB6)
426-433 F8.6 ct/pix BgMapB8 ? Background value for the total band
(BGMAPB8)
435-442 F8.6 ct/pix BgMapB7 ? Background value for the hard band
(BGMAPB7)
444-451 F8.6 ct/pix BgMapB6 ? Background value for the soft band
(BGMAPB6)
453-461 F9.6 s ExpMapB8 ? Effective on-axis exposure time in the
total energy band (EXPMAPB8)
463-471 F9.6 s ExpMapB7 ? Effective on-axis exposure time in the
hard energy band (EXPMAPB7)
473-481 F9.6 s ExpMapB6 ? Effective on-axis exposure time in the
soft energy band (EXPMAPB6)
483-494 F12.6 10-15W/m2 FluxB8 ? Flux in the total energy (0.2-12keV)
band (FLUX_B8)
496-505 F10.6 10-15W/m2 e_FluxB8 ? Error in FluxB8 (FLUXB8ERR)
507-518 F12.6 10-15W/m2 FluxB7 ? Flux in the total energy (2-12keV)
band (FLUX_B7)
520-529 F10.6 10-15W/m2 e_FluxB7 ? Error in FluxB7 (FLUXB7ERR)
531-540 F10.6 10-15W/m2 FluxB6 ? Flux in the total energy (0.2-2keV)
band (FLUX_B6)
542-551 F10.6 10-15W/m2 e_FluxB6 ? Error in FluxB6 (FLUXB6ERR)
553-564 F12.6 ct/s RateB8 ? Total band count rate (RATE_B8)
566-574 F9.6 ct/s e_RateB8 ? Error in RateB8 (RATEB8ERR)
576-585 F10.6 ct/s RateB7 ? Hard band count rate (RATE_B7)
587-596 F10.6 ct/s e_RateB7 ? Error in RateB7 (RATEB7ERR)
598-607 F10.6 ct/s RateB6 ? Soft band count rate (RATE_B6)
609-617 F9.6 ct/s e_RateB6 ? Error in RateB6 (RATEB6ERR)
619-627 F9.5 deg RAdegB8 ? Total band right ascension (J2000)
(RA_B8)
629-637 F9.5 deg DEdegB8 ? Total band declination (J2000) (DEC_B8)
639-647 F9.5 deg ePosB8 ? Statistical error on total band
position (RADECB8ERR)
649-657 F9.5 deg GLONB8 ? Total band galactic longitude (LII_B8)
659-667 F9.5 deg GLATB8 ? Total band galactic latitude (BII_B8)
669-677 F9.5 deg RAdegB7 ? Hard band right ascension (J2000)
(RA_B7)
679-687 F9.5 deg DEdegB7 ? Hard band declination (J2000) (DEC_B7)
689-697 F9.5 deg ePosB7 ? Statistical error on hard band position
(RADECB7ERR)
699-707 F9.5 deg GLONB7 ? Hard band galactic longitude (LII_B7)
709-717 F9.5 deg GLATB7 ? Hard band galactic latitude (BII_B7)
719-727 F9.5 deg RAdegB6 ? Soft band right ascension (J2000)
(RA_B6)
729-737 F9.5 deg DEdegB6 ? Soft band declination (J2000) (DEC_B6)
739-747 F9.5 deg ePosB6 ? Statistical error on soft band position
(RADECB6ERR)
749-757 F9.5 deg GLONB6 ? Soft band galactic longitude (LII_B6)
759-767 F9.5 deg GLATB6 ? Soft band galactic latitude (BII_B6)
769-780 A12 --- Flag [CLEAN_SAMPLE] Flag for source included
in the clean subset (VAL_FLAG) (8)
782-818 A37 --- SnameB8 Source name defined in the total band
list (SRCNAME_B8) (9)
820-856 A37 --- SnameB7 Source name defined in the hard band list
(SRCNAME_B7) (9)
858-894 A37 --- SnameB6 Source name defined in the soft band list
(SRCNAME_B6) (9)
896-926 A31 --- XInameB8 Name of the image containing the total
band detection (XIMNAME_B8)
928-958 A31 --- XInameB7 Name of the image containing the hard
band detection (XIMNAME_B7)
960-990 A31 --- XInameB6 Name of the image containing the soft
band detection (XIMNAME_B6)
992 I1 --- Inext [0/1] Extended source flag
(VER_INEXT) (10)
994 I1 --- Halo [0/1] Halo flag (VER_HALO) (11)
996 I1 --- HIbgnd [0/1] Bright region flag
(VER_HIBGND) (12)
998 I1 --- Nredg [0] Not used in XMMSL2 (VER_NREDG)
1000 I1 --- Psusp [0/1] Inaccurate position flag
(VER_PSUSP) (13)
1002 I1 --- False [0/1] Catch-all for problems not included
in the other flags (VER_FALSE) (14)
1004-1041 A38 --- Com Suspect attitude reconstruction in RAF
(FLAG_COMMENT) (15)
1043-1077 A35 --- Ident Cross-correlations of the positions of
the slew sources (IDENT) (16)
1081-1096 A16 --- 1RXS Name of the closest Rosat All Sky Survey
(RASS) source (RASSNAME) (17)
1098-1116 A19 --- Type Source type (ID_CATEGORY) (18)
1118-1125 A8 --- r_Type Reference for Type (ID_RESOURCE) (19)
1127-1136 F10.6 arcsec DistC ? Distance between the best match
candidate and the slew survey source
(ID_DIST)
1138-1143 F6.3 arcsec DistR ? Distance from the best match ROSAT
source and the slew source (RASS_DIST)
1145-1147 A3 --- ModeID Observing mode of the EPIC-pn camera
(MODE_ID) (20)
1149-1153 F5.1 ct/s ImBGRate Peak background count rate in the image
from which the source was extracted
(IMAGEBGRATE) (21)
1155-1164 F10.4 d MJDStart Start time of the subimage where the
source is located in modified Julian
date (MJD_START)
1166-1175 F10.4 d MJDStop End time of the subimage where the source
is located in modified Julian date
(MJD_STOP)
1177 I1 --- OPTLOAD [0/1] Warning flag indicating that the
source may suffer from optical loading
(VER_OPTLOAD)
1179-1182 I4 --- FiltCt Number of counts found within a
1 arcminute radius about the source
position after standard filtering is
applied (FILT_CNTS)
1184-1187 I4 --- UnfiltCt Number of counts found within a
1 arcminute radius about the source
position with no filtering applied
(UNFILT_CNTS)
1189-1211 A23 --- USXMMSL1 Name of the same source in the previous
XMMSL1 catalogue if existing (US_XMMSL1)
1213-1219 I7 --- USExtras Corresponding SRCID value within the
EXTraS LTV catalogue (US_EXTRAS) (22)
Note (1): This is the official name for sources detected in the XMM-Newton slew
survey. It starts with the prefix, XMMSL2 (evolving from XMMSL1, the IAU
registered designator), and then encodes the J2000 sky position, e.g.
XMMSL2 J010537.6+364858. The name is assigned in two passes. When the three
independent energy band source lists are combined to form one catalogue the
source name is set using the position in the band where the DET_ML likelihood
is the highest. A second pass is then performed such that sources which have
been observed in more than one slew are given the same name. Again, priority
is given depending on the detection likelihood. Note that the combination of
UNIQUE_SRCNAME and observation number (OBSID) is unique. Detections are
deemed to be from the same source if their centres lie within 30 arcseconds
of each other. Note that the statistical position error (RADEC_ERR) calculated
by the source search software is not used in this calculation. This is
because the systematic error on the slew attitude reconstruction dominates the
error budget in many cases. Given the scarcity of slew sources on the sky,
30" was found to be a reasonably robust match radius for point sources.
It is not so good for extended sources and the catalogue may contain multiple
detections of the same extended source with different names.
Note (2): This is the observation number assigned to the slew by the satellite
scheduling system. Slew observations always begin with a 9 to distinguish
them from pointed observations, followed by a 4 digit satellite orbit number
and a 5 digit slew designator, e.g. 9031400004, refers to the second slew of
revolution 314.
Note (3): In the event of a detection in more than one energy band, the
coordinates are taken from the band with the highest detection likelihood.
Note (4): Statistical error on the source position as returned by the source
detection software.
Note (5): The hardness ratio, defined as
HR1 = (rateb7-rateb6)/(rateb7+rateb6)
where rate_b7 is the hard band count rate and rate_b6 is the soft band count
rate. This has been calculated for the 1936 sources which have a positive
detection in both bands.
Note (6): Error on the hardness ratio calculated as:
sqrt(rateb7err*rateb7err + rateb6err*rateb6err) /(rateb7+rateb6)
where rateb7err and rateb6err are the errors on the hard and soft band
count rates respectively.
Note (7): This measures the deviation from a point source of the spatial
distribution of the source counts. It is defined as the sigma of a Gaussian
which would need to be convolved with the point spread function (PSF) to
produce the observed counts distribution. The software (emldetect) fits
sources out to a maximum extent of 20 pixels.
Units: 4.1"x4.1" image pixels
Note (8): A text string which is set to 'CLEAN_SAMPLE' if this source is
included in the clean subset.
Note (9): The format is 'xs' followed by the revolution number, the observation
ID and the source position, e.g. xs0841908410000212:57:07.5+01:50:42
Note (10): If set true (1), this flag notes that a detection has been found with
in an extended source and is probably false. This flag is used to ensure that
only one source is quoted for the large supernova remnants.
Note (11): If set true (1), this flag indicates that a detection lies within the
point spread function, or halo, of a very bright source and is probably
spurious.
Note (12): If set true (1), this flag indicates that the source lies within a
bright region, caused by high background, and is probably spurious.
Note (13): This flag indicates that the quoted position of the source is likely
to be inaccurate. In a few slews the attitude reconstruction is poor and in
these cases the actual position of the source is difficult to determine and
can be wrong by an arcminute.
Note (14): This is a catch-all for problems not included in the other flags. In
the catalogue 99 detections have this flag set true. Reasons include: the
exposure time has been calculated as zero, a detection due to a very bright
source, e.g. SCO X-1, out of the field of view, a possible cosmic ray or a
very bad attitude reconstruction.
Note (15): A comment which explains why a particular source flag has been set
to true
Note (16): Cross-correlations of the positions of the slew sources with
astronomical databases and catalogues have been performed (see section on
IDs). This column gives the catalogue name of the best match.
Note (17): Voges et al. (1999, Cat. IX/10) and Voges et al. (2000, Cat. IX/29).
Note (18): The source type as returned by SIMBAD, NED and the other resources
used in the cross-matching process. This is directly taken from the catalogue
in question and no attempt has been made to rationalise the values.
Note (19): The astronomical database or catalogue from which the best match has
been selected. e.g. SIMBAD, NED, etc.
Note (20): Observing mode of the EPIC-pn camera as follows:
FF= Full frame mode
eFF = extended full frame mode
LW = large window mode
Note (21): Peak background count rate in the image from which the source was
extracted. This is measured as the count rate, over the whole image, for
events with energy >10keV (PI>10000). It is quoted to a resolution of 0.1ct/s
and is used to determine the overall background environment in which a source
was detected. This value is used in the creation of a clean subsample of the
catalogue (see top level description). Generally, the higher this value, the
greater the probability that the source is spurious. This is especially true
if the detection likelihood of the source is less than 15.5. The value has
been tabulated for images with a background rate greater than 2ct/s. For
quieter images the value has been artifically set to 1.9 ct/s.
Note (22): This release of XMMSL2 makes use of work carried out within the
framework of the EXTraS project. XMMSL2 is closely linked to the long-term
variability (LTV) catalogue within EXTraS, and this US_EXTRAS column provides
the corresponding SRCID value within the EXTraS LTV catalogue.
History:
Copied at https://www.cosmos.esa.int/web/xmm-newton/xmmsl2-ug
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(End) Patricia Vannier [CDS] 09-Jan-2018